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I've read about other people doing it for this laptop. I've opened it recently to clean dust out and the CPU is very easily accessible via a panel, you don't need to take the thing apart. I took that opportunity to reapply thermal paste to it. Apparently you can change the graphics card too, but not concerned with that at the moment.

Theoretically, should work without problems. Before upgrade update bios with newest available. t9400 has a somewhat higher TDP, so I'm not sure whether the existing cooling could be enough for it. However p8800 is safe bet.